6 300,000 kilometers/seconds (in vacuum)All of types of electromagnetic radiation share one similarity between them:They all travel at the same speed of light 186,000 miles/seconds (in vacuum)Or300,000 kilometers/seconds (in vacuum)(in vacuum) through air and space.

7 When light slows down or changes direction we see refraction of lightExamples of refraction:

8 The speed of light depends on what it is traveling through.In water, light slows down to about 200,000 km/seconds